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Bacterial Signaling

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...

Gene Regulation During Sporulation

Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...

Stringent Response in E. coli

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

Regulation of Bacterial Virulence

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

Gene Regulation in Microbial Communities: Quorum Sensing

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...

Endospores and Sporulation

Endospores and Sporulation

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...

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Related Experiment Video

Updated: May 24, 2026

High-throughput Screening of Chemical Compounds to Elucidate Their Effects on Bacterial Persistence

High-throughput Screening of Chemical Compounds to Elucidate Their Effects on Bacterial Persistence

Published on: February 23, 2021

Signaling-mediated bacterial persister formation.

Nicole M Vega¹, Kyle R Allison, Ahmad S Khalil

¹Howard Hughes Medical Institute, Boston University, Boston, Massachusetts, USA.

Nature Chemical Biology

|March 20, 2012

Summary

Bacterial indole signaling triggers antibiotic tolerance in a subpopulation, a phenomenon known as bacterial persistence. This occurs via activation of stress response pathways, leading to increased survival rates against antibiotics.

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Population and Single-Cell Analysis of Antibiotic Persistence in Escherichia coli

Population and Single-Cell Analysis of Antibiotic Persistence in Escherichia coli

Published on: March 24, 2023

Area of Science:

Microbiology
Bacterial communication
Antibiotic resistance

Background:

Bacterial persistence is a critical factor in antibiotic treatment failure.
Understanding the mechanisms of bacterial persistence is crucial for developing new therapeutic strategies.

Purpose of the Study:

To investigate the role of indole signaling in inducing bacterial persistence.
To identify the specific pathways involved in indole-mediated persister formation.

Main Methods:

Utilized microfluidics to monitor indole-induced persister formation in real-time.
Investigated the involvement of oxidative-stress and phage-shock pathways.

Main Results:

Demonstrated that indole signaling directly induces bacterial persistence.
Identified oxidative-stress and phage-shock pathways as key mediators of this phenomenon.
Proposed a model where indole signaling primes bacteria for antibiotic survival.

Conclusions:

Indole signaling is a significant driver of bacterial persistence.
Targeting indole signaling or associated stress response pathways could be a novel approach to combat antibiotic resistance.